*{
	margin: 0;
	padding: 0;
	box-sizing: border-box;
}
ul{
	list-style: none;
}
#left{
	position: absolute;
	left: 0;top: 0;
	width: 220px;
	background-color: #333;
	color: #ccc;
	a{
		text-decoration: none;
		color: #ccc;
		&:hover{
			color: #fff;
		}
	}
}
#right{
	margin-left: 220px;
	#head{
		height: 50px;
		border-bottom: 1px solid #ddd;
	}
	#main{
		iframe{
			display: block;
			width: 100%;
			height: 100%;
		}
	}
}